Patent US3875603A successfully refreshed from Google Patents.
US3875603A
Expired / Lapsed
US
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Gangway construction
Assignee: American LaFrance LLC
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Filing: 1974-02-08
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Granted: 1975-04-08
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Expires: 1994-02-08
Abstract
Abstract A gangway is connected on one end to an annular platform surrounding, and movable up and down a spiral staircase.
Inventors
- 👤 Johannes Josephus Mampaey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:21
CPC Classifications
E; E01; E01D; E01D15/00; E01D15/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A gangway construction, in particular for boarding and leaving tankers, comprising a tower and a gangway which at one end is movable vertically along the tower, characterized by an annular platform movable upwards and downwards together with said one end of the gangway, said platform surrounding a sprial staircase disposed in the tower.
Claim 2
Dependent Claim
53 words
A gangway construction, in particular for boarding and leaving tankers, comprising a tower and a gangway which at one end is movable vertically along the tower, characterized by an annular platform movable upwards and downwards together with said one end of the gangway, said platform surrounding a sprial staircase disposed in the tower.
Claim 3
Dependent Claim
28 words
A gangway construction according to claim 1, wherein a control system adjusting the platform height keeps the angle of inclination of the gangway automatically within a pre-determined range.
Claim 4
Dependent Claim
25 words
A gangway construction according to claim 2, wherein the control system adjusts the platform height in response to the angle of inclination of the gangway.
Claim 5
Dependent Claim
21 words
A gangway construction according to claim 3, wherein the platform always stops at the level of the step of said staircase.
Claim 6
Dependent Claim
20 words
A gangway construction according to claims 1, wherein the gangway is rolable in horizontal direction relative to the gallery platform.
Claim 7
Dependent Claim
56 words
A gangway construction according to claims 1, wherein there is disposed along the inner edge of the gallery platform a railing which is so turned during the lifting or the lowering of the platform that there is always an opening in the railing opposite that step of the spiral staircase which is flush with the platform.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |